Web Site Icon for mobile shortcut

The image size is key. At least 192×192

Reference:

  1. https://stackoverflow.com/questions/11761864/how-to-define-the-website-screen-shortcut-icon
  2. Example:
    1. https://stage.bunnymenu.com/
    2. https://www.obooko.com/blog-post/add-web-shortcut-icon-to-iphone-or-android-phone